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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb471fd827dce92d5db84d2f8d6629a5d88c47b5f5a89c4c02b41e6c27325463' 
  AND token = 'njEG0g34I1h5/WU/CEUI7Sjjs/6Hjd1/1f13kzvnmLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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