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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55236ae75cdf1769159d2e869464d0e450c5c2b93e1c14a91a6218dc8b1ab87c' 
  AND token = 'V4DzFxyi/SZThzxcHBOShh+VHSk+icWKZ03OiNIyLzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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