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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f969dd8a5d9aa3c4086c710f2f4a1a49f3a682708a5dc16a3083d53c8cb3ef' 
  AND token = 'G4K03u4ea3H66twO3UtEcUeLiFGgXsaMg4hI7ruH9io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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