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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f81fc80e4503c353b2bde339930a25ecb860aae9c9694da1688ed33afb3d763' 
  AND token = 'QNCc8Q33u68Z4EpPCh8vB4RRBZMlqQumK1lZefVn2fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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