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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8dd5d2c65d5bf76f663619d379d9af1f9335b12f2425aee103c5aa370cd4f88' 
  AND token = 'SVFL3bvddWvbP4tRUNCVFcSd2MQYMP8y273662JBIJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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