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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee2457eb62f0f3a5a481dd53099de07a0e7c9eb3d305b2eca132d2d84c3bd6c7' 
  AND token = 'RzkeaIEUxKPSqyPDBAb3wteoChBgfz6MH08YXDAWm7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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