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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb7b25817137accccd516afd7407ebcd23451c81a6f9e3c5033adbd385efded' 
  AND token = 'ADQNO8NEau88JMJCiUhx0/lHEkQRZWAEVWTwrlnj9hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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