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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd27d9acf825cea8f4476a1c7263e356f0168afb49e2f304e460ebdd7b5235a2a' 
  AND token = '7XeGGFQ3Lgs9i55SeHcXrPGOdwn30b7R383UQcXcH5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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