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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '579cb6b4f2366b7215b767409fbafe267b79a1ea76eef215b24eae3d0165501a' 
  AND token = 'jpfhWhrOVARZzT8z8H4343C5QFoAReoYRwJTqUqvNTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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