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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78adcef8a2eb87e910e33e190d2ba55f8615e7080242fa3020308c9800e1ae02' 
  AND token = 'G3JyDxvh6vuI7abU0MIzF7HZru9ep9QqsDgZtpWAhx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}