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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d0203ecf1a6603845c6182dc75d3b94814817c6e1f2b12be0d58b0bba55030' 
  AND token = '9ZL02ohOIaRkqxedazF2Ur5NEuFcxqRzk4jM+pUB1KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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