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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e84581314169164332969ebe95f4a458c26d03b0b927bb57b99502cfe2d67f3' 
  AND token = 'Zq7ZTMFIt72cYhttY1fDDZ58jw1ooppTeAJtvcEhwx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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