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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52a85b612fb9c6123df498c8cc19eb9fb8e9e972e66d425ea820cba6e709d43b' 
  AND token = 'E3NZvMXIl5tfRqObqMt7IRubmIm5wgoU6IFyGVYhJxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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