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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7113b50b2e82d8ebbd738bb6e8c060f02e9f59662d5b85b3eda6104c04421a8f' 
  AND token = 'nPOXkqZbyqFHml/HEcFeFzniJOTpA1EHRre3ZlxSD/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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