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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3d662dc7fd64ae1b082ecfcf156da2fa337c9853dcec95489f27617d68f348' 
  AND token = 'A95whClvsaB5dw/lrnWd08YU3P93jWLsuYehO1MeTSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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