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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7acf47c33cf2625098ce0667cc2a87b060f9fd75add8abb37b50ca50e1427333' 
  AND token = 'aZx7kBes15HHtt36a06zw58I6v0gzoLcxVUcz8YyaAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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