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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f2ee3169600a0ec06b4e324ecd852b4f57e73100e1d5bbf67c74a385c1db118' 
  AND token = 'UE9cbqCfeOs9fe7fZyXHOJRIr1lDHt1PSPQ9X/7or6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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