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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ad8a3db298158f1758dc7e27aa43a36ad2d5e8eafce50fc8f5bc72393d604f5' 
  AND token = 'cDJvPD7xF0uRFUhh7Qw3RGPu6gG4W5I3OHk7XxRA6PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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