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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '118ed51514530e2d4d8f70f9c1ee5b05d65f7219ca64c4a310be5f68a1bd5419' 
  AND token = 'mLaFObbED24MLWr12MFicxgfmv16l97Nyu/6oSiYKNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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