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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c3f8d9f6ab7813349125bc28e1af072eb3cf537130eea97e70bd9a0c6d65c95' 
  AND token = 'SWDHv5slahr3E/ZPoYXKvDFiODnl6o7LMyWtWu4Uows=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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