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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b09c5bcd8efac356b016ad43edc98fdef1465596357dff3dae3430137a0dc7' 
  AND token = 'DtfuBPkhY+A3iQPRo42XCE/TOOQtdaSrW2qi1CoQvuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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