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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71aea7b30d1c219668476ae4ce23ef1dda21ff889000568f3e9e10d897c9e9f4' 
  AND token = 'F5D0kGni6LTuyaxgd4mVqq8W5037z1ieyjbgeQo1ZTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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