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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f3d8af9b770d56b39bc8ad50420d6ae678e8a890c6d472a66ee4994db2ab8c' 
  AND token = 'yaJJZ8dg2F1MUx2PsRzbHL7wZwUJZIzCjxEeOKC0Cvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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