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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1dae0f961ba4d452a7dc2954f4b6f37e198bda8c40f9b18d9d66b853ae9ee6' 
  AND token = 'v0imBDoRcAoSkqJULX5N76SLaQle04ZMXHyfh4GvJPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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