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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cffe44d60a0e1c98f35ba3aeb3f73f0d788dd57a784167f88df20234d6b12367' 
  AND token = 'Va354DO6GWVzW7So6gsHVtQcsutRy11hR30CaWNWqDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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