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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dd0f9c7dda3899e55443350eb318c94122a05185f7fbf0ca4d576c816fb9eca' 
  AND token = 'ncLK/B4QmF6HktP27xtTIeFFFSTEnE4gKGj0XjeRvec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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