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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7862f48ce4fa08c121ae2272ee4cac0f58d2779d96d1cf582c594ffaf7346b00' 
  AND token = 'S/Ob1AbwHpmHBeZFGK3z9GluXGzoBA7lK/iwTw1r3XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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