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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59d618399a033c7c6e1ccf4640b43bd497f188955a519e64b41bc3a4bdb1b9fa' 
  AND token = 'OxBuZPUN75qfeL5F/Ssj0triav8cG1Q6d7uN+wg3mZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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