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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '546e3f8742064144300b614eb500a8a5695fec8dc8f666878de451d1d14bf77d' 
  AND token = 'mSNN4udNU5wHOSaKDvmquj9cT+9eSk/I5sYIcvHiMcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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