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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2cde4b04ea5739c4e8a1fb12fd7ffb242ebd7300f4f6e000d7bdfa6356bd531' 
  AND token = 'sYJiLD9R0jaZmCOEYgRQaIfZJr+Xcl8DnrY8swjSDPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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