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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d75cb2246a7f3f008aa4dca1d3b6ef0b6d4f6fac544e0e251fe2ee0a6847531' 
  AND token = 'KASW2a9qgIDIqGHiXxt7jeRHUHUw9pJjHfoPuxTzpbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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