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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '203f2f8d4a7864970af978e3b983358461e991d7169e53c0784570af32773485' 
  AND token = 'E4DD0sZ/mL5XFh9ll6T1xuVM13X0twGHBAs1hAhZSeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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