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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b65c88f762aea8147b8665d74d668ae57ea31d9385fd58237a28144e94a38e6' 
  AND token = 'n7eEqE8IWSk6H9qA5CRIWx7KDoYUQqQ9jPXMd7bOp8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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