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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9204c4e5a0edb1683c792ae875760e5a2736b0c8b81ca5252165071659b184a2' 
  AND token = 'HH1toUUpYwCmbrk9msxn70eNvd/L/AXVcsF1fgfG5U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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