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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d214d657ccec88d140da938458939817bbb0427e88fde3d6852ee29f0efdc8' 
  AND token = 'hX1vIpS6c4xgFwXfp3eV83w6MuGniBlSwmTz8wep1Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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