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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd6558a57733b9de6b60cc709707896d9e39318c5476f59d4e82411bdea011e9' 
  AND token = 'IpsX7IrEM3SMV9t1B7P5KxdnZYjGaCqtPElHTUJOJnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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