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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c7a344058f94b282d57b0786f3633afda1e30dd9002ce860f40bc7d414785a' 
  AND token = 'yfWzLC1blUiQ0Y0W92FdCgf7kJT5RjCDM5rAQ1btuNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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