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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b9b3792efa34388763e1cd5304ef4489ee8d60ae68d53972e7a2b41374c1fdc' 
  AND token = 'Io+iAFpVOASnyIbl/r8EU6QWmdkx9trwTtNB88Gf5+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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