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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f56d17a0e9c0cec1d83e350e01b72132aa10aa453a661363977804936d656c4' 
  AND token = 'B9ds0uDxeLZp7mPeNoEBMnFcjRZ8bIN29ET0flvEGsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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