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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a05d44a8e63c859f6888fbde2ad5ba39e96235d4bf477dcf51341a0e61b130' 
  AND token = 'ISDnQecyK8oA3MiPRTJ1dNl6UFJNmE60Q912cxnX1hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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