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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c4e62925a71670f694c697d339157e553e502671ec890b9a4cc7e81b48b97c' 
  AND token = 'vZ8Ao71dnPSGu+3B73x3rlFS7YNzg8YEuAK7bnO/yWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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