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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03c28805d9e18a42841090cf9a896e6355f02b77e602f73756cd68197b4238d' 
  AND token = '3a6ES0D24AU1hh+XG5qZjCagEdYAEBYpxPNYV0VT9Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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