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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f66586a7da3ac5b85e24c9548da84a7a3c5b330e66dd6dd5aaeb1d3e218521' 
  AND token = 'q9ccNDAqhHMAkgj3AgNtIupTPZyWQRcYgD9pmNI/bRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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