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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27c1cd6f1e6e7bc923b92583a921dee08a7f76490aebbb58c8a90b00efb8f49c' 
  AND token = 'T0nSEODWcjAUeTxosq3mV95q/M2wlNgouYJdge6HPBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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