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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb2dd611057de8dadf715545185a15c970d3cb2443f99ccbe51e6b0220c1ce0' 
  AND token = 'fUrSnNJuqEBA+nImy7ht9/y7fB37KFJVuxd4dHTk5Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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