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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fbec39631cf879347d443b73abf3e6a8c5393f7ce240e348bf1409d1f0f1dd1' 
  AND token = 'enEMDoY06NrvOqY/QI7/AFgQgzT99udB6ESZn6/gG4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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