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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e3e637b1d85960ede33624b3c1aebd3f0e84f0777cbd1a49920123268dee672' 
  AND token = 'L3zmM6qvGy0rVFc8hCILH5sA9YbVn8W4J7SC7tDzVm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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