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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ea522fe30080f2f3316d4830a3afacf7ad5a517573a7fab3e48c88d86392b0' 
  AND token = 'OH6VNTEoHHEX0Unx9iFnGGr0Nim0C0fA+3zT2Jcml3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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