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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c94d6c30823578080d1feb4fb531d914cfe59b2f3db1912480b8553ce148296a' 
  AND token = 'LyxRHTO1YM2EFx9RmI8yJlx0IFUnudaR/5B1n7yk8z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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