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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7443b091f22db7ae6566b17f77a68901a800b8aa190acd7129ea53c9722c10f0' 
  AND token = 'WBD57IhTrHI8jU6o8+6LujbZ35xNWL1vbbaSqd3ZpzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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