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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b819d00509235dedfc20809c65625e147444f7a62959ae2356d3c90debe7c83c' 
  AND token = 'mastFyDweCk5aep2qtWFRFmwaOejTnl1PDETxW0oA9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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