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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0b19cc44d7eaecb8d900ec0af5cb976dc36907da458a9a153f1455bbafb293' 
  AND token = 'mx3axSGn/Pp8l/ULxD6rpTSiBqClmrMIj0AGuarqeEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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