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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9a2e875247e90a7264f0235b591e444f6f7ad973b1f37eef1ad87b438ca4ab' 
  AND token = 'rJ/30tjKn8MrzqlyXCJZKn+K0p0fXQ1WoAzOTYWy2ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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