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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e573e8d8497a6f3ef202567326bf81f1f18367902c828419962031dbedfb9e' 
  AND token = 'vpayTwgvX7ueTsaTZQL/eqldGedFZS0fc9Iia57cgW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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