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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934e5d61ab1e6fc65d57d53c04e29ac574d3c7a91b1184dc5cffee3b8e4aa05f' 
  AND token = 'd31/PQPqzzi0kyAJ2Egc2AMffWRGrHS/6Z5UNjlJhn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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