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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ff472e96d9d6e918341d8c03c1d31ae6bbb036824dafa88e9f28bb30eb5863' 
  AND token = '8tgtW8t5jloBc1/DfCSlJgVJi7YwGkGPpySr2Knn+bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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