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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631b15ba4589c63b75caf1a6e59786a75db68dda9ad9885d28f8d89f0d0d2d8c' 
  AND token = 'RzC0hesWnZJFEyrHSO7Y9+tp7m8/0bacWmK8HCRNWdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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