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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01132aebc237e78c2a32196172d6203fdbbfc8b1c095f61190c7bd45ec6b08cd' 
  AND token = 'sAPIU0/imb8B9PMZqrYPfgvHbUS82cTDsG77HOpDCP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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