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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7477aa7d377f7ef9e20e986617542ba87f0022685ab11099bbb5dd03597bf921' 
  AND token = 'syx7YK44tjpUVLvd33Lo7VQbaIeU2nvYhf3PKNHz0Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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