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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '119b550c57046a0090d9d47da29c8c95f0358a348eb0df35dfbf8a0b310f22f5' 
  AND token = 'H9Fh/eX+bNdmzhpwW8l8DWiBL9sfBEIb813W780QN7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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