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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f830c7d60e67dcb7472b71bffb33c50dbf78a3c4ff2e65f9097d8ed930cf92' 
  AND token = 'M6Ful+q8xJvYKFor0luoanOctunpPByP9Grw4IGQr0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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