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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f8c56c39139b00a18262e40c1ce4c82ea71a0bfe96d189eb0ae5aa6d71122d' 
  AND token = 'j2YbADcWQQNWEWJtEdIi4Jjryu2hBdrf0EoYI0dx1YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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