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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8efc519051be76ccd0e825f364f5e9a16d1a0a2aa40c50be1892a0c66695476c' 
  AND token = 'hBs4TxzMVhl9ZtPKprMzZ/eOx9htWiwnWgSH6A0aCww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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