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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0540370bc750e1d6d18ee795551bf2aa8f0192a19537436246b2ef1d9eb63b68' 
  AND token = 'idpG/xFQQfPDQZ/7iJiyNzibVT5rjEPcGnVIx9Znoc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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