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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ae536896f195d7e02a7fe3cae97ac53d907f2c912dc230ea2f1834739e5c13' 
  AND token = 'SRj7I6m3JNW3wMw2iej9jg/0yayL//dbMSyB0+xTjP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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