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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be97803a9ae75bfe74542128886725cbaeffa40e6a16ae0e93a3105e417b010' 
  AND token = 'LzFci1+kCyE2G1lHbkqmxeOblhpKe4LWZI/EclaDDb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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