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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c3f4c1ef7e7894fbea085715d8df6ab517e1a131ed767fd112cedd9dcfe11e' 
  AND token = 'zJmEaD30npMcdnZUDGKXjnboR6+7b1ga+7MYo8dL2rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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