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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df3d1006f6cb8d8487388dc7555e2600dd667f895635f9d719d7894ef222899a' 
  AND token = 'WBEHlPP92lluwLf7BT9bN6Pe4xqqAGpmaEIR3RVHJsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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