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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4894d19115af7c499109922fdee0aa4a7a21697c6963a39cd8d7132a8f0da9ed' 
  AND token = 'gepn+Z7i+2xHCesH3gq0AJFoWabS/wMwq96y4xcmDu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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