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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c9199190241a2970c2ef5b8ad9d2f035645d4f5ee23f6b5730f0cd65ca08a95' 
  AND token = 'Zok66OlXf2hOt/5gZik/UnO5F9cYKo+Vu/cJpE2Ohdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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