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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '639a4e4d49ed1853fd2b4831b0848499b5d8c4f7f0473e5f9804b364181f8460' 
  AND token = 'gLL5xmZ8Nfj6aX48uMiv7Od+L1XObgqlcWeRr+ovH2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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