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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a752babfd81c97ec5b6d35f96fec6f1625d34658b519fd0c58321b9e731285c' 
  AND token = 'Q6NorIJE/6pz3AiC9AskSqVNsyMxDT8vneW18hF6aF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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