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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e39d93b66d406f6007acc1b4c119ca25b0c94da7a232666b7af24f494b02c8b0' 
  AND token = '1zd9zsymK7SiBKZhimL3f9FMkZMG4RcddrtwJS3Gz0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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