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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e45b90043750cf07043d9ed4ac3338751742d50bbd0959f8d2061ad622cba1' 
  AND token = 'tycU7VOHx/xZjr+NrpT1PThsD+Q2rrpWO7vMVy2OPMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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