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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2959522240fd5adfff1044f23d8c12cc71ee0a7007ae3919a1629fe1c62130c0' 
  AND token = '2/2txf2WbvHr6ZB6fzoBc6AYmtu88b8LeAK2sT36gLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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